For example:
“The esoteric Zhen Yan (Chen Yen) or Tantric school – better known by the Japanese name Shingon…” and “Chan Buddhism, better known by the Japanese name Zen…” from the chapter on Korea in “Buddhism A History” by Noble Ross Reat (pg 176-177)
I wonder if Buddhism was spread by Americans who were in Japan during the occupation, the same way that (Western) futons were. There is also the fact that both of the two mentioned in those quotes became much more successful than they ever were in China. Might well find out the answer to this is I ever finish the book…